The Museum of HP Calculators

HP Forum Archive 21

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HP-11C and complex numbers
Message #1 Posted by Antlab on 27 June 2013, 5:02 p.m.

Hi all. In this period I am exploring the interesting world of the calculator emulators, in particular for my new Android phone. It is fascinating being able to retrace decades of development with the various models. In these days I found a nice HP-11C emulator for Android, and I am trying to discover the main differences respect to the 15C, that I know a bit better. I also downloaded the original manual, but I still have a doubt, concerning the handling of complex numbers. I see that the 11C, as the bigger sister, has the (i) and I functions, (over the COS and TAN keys), but I did not understand their use, because it seems that it doesn't have a Commplex Mode as in the 15C. Could you please clarify this issue? Thanks.

      
Re: HP-11C and complex numbers
Message #2 Posted by Marcus von Cube, Germany on 28 June 2013, 2:53 a.m.,
in response to message #1 by Antlab

The 11C does not do complex arithmetic. I and (i) are used for indirect addressing exclusively.

            
Re: HP-11C and complex numbers
Message #3 Posted by Katie Wasserman on 28 June 2013, 3:11 a.m.,
in response to message #2 by Marcus von Cube, Germany

Register I is also used for loop control.

      
Re: HP-11C and complex numbers
Message #4 Posted by Thomas Klemm on 28 June 2013, 3:15 a.m.,
in response to message #1 by Antlab

Both ISG and DSE work only with register I.

Cheers
Thomas

      
Re: HP-11C and complex numbers
Message #5 Posted by Torsten on 28 June 2013, 5:52 a.m.,
in response to message #1 by Antlab

Have a look on the compare features function on this site: HP-11C vs. HP-15C

            
Re: HP-11C and complex numbers
Message #6 Posted by Antlab on 28 June 2013, 8:59 a.m.,
in response to message #5 by Torsten

Thanks to all for the fast answers, now I understand better the differences between the two models concerning complex numbers, and will try to study the question of indirect addressing with (i) and I.

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